I also thought of another reason to title it Pearl. I'm not sure Dukat received his implant here or a little bit later, but the implant itself became a pearl--more in physical appearance than the meaning of its beauty, but it gave him something special, it was, in a way, a treasure for him.

Dukat received his implant later--though in the story he sees one of the doctors who has one for some (undisclosed) mental illness.

It took him time, once realized he was going to have surgery to install an implant, to really reconcile himself to that. But over time, you're right: he came to see it as a needed part of his own body, one that helped him.

I had not connected that with the title, but it's an interesting thought.